Items are Continental Push Rods part number believed to be P# 537870 (was unable to find O-300 manual to confirm). It is as-removed from a Continental O-300 C / Cessna 172 (C-172 A). These are as it appears in the attached images. Oil covering added by owner as a preservative. 

Seller is not an A&P and cannot advise as to the state of the part or applicability to your aircraft. Any part numbers have been obtained via parts manuals for the aircraft from which the part was removed. Unless otherwise stated in this item's description, no documents (to include copies of logbooks, 337's, certifications, yellow tags, etc…) are provided for this item. Buyer assumes all liability. Please ensure your A&P inspects the product to ensure it is airworthy and appropriate for your aircraft prior to use! 

Thank you for looking!